The 6s has is responsive though the battery capacity is small so you need to charge it often. The camera and video is still great. Bank apps work well on the 6s as well as popular apps
Yeah the battery life definitely isn’t one of its strengths, but I feel like when the battery is like above 90% it works very good. In my latest experiences I’ve had a few iPhone 6s with batteries ranging from 72-87% and I’m still impressed with the performance regardless of how often it needs to be charged